If you view it from the point of view of being a stackoverflow clone, you'll be frustrated (now; less so with the full 1.4 release I think).
If you view it for what it is - a solid, reliable, compact Q&A system that has essentially no dependencies beyond a working PHP+mysql install, maintained by a responsive and communicative developer, it's an excellent choice.
I started off on my Q&A development with a 'stackoverflow clone' called Shapado, which, while being the strongest clone of SO that I've seen, is a massive, seriously overengineered system with a very complex set of dependencies (and I say this as a skilled Rails developer), and a rather frustrating 'support' network. With Q2A I've been able to completely and smoothly integrate a Q&A system into an existing website, retheme it and understand its function.
Q2A offers you the chance to understand everything about how the system is implemented, and will in 1.4 offer a plugin/widget/event API system that should allow many innovative features not currently seen in any of the 'clones'.
Worst stackoverflow clone ever, and I'm pleased with that.